
header {
    width: 100%;
    height: 100px;
    background: url("../images/top_opt.png");
    line-height: 100px;
    position: absolute;
    z-index: 2;
    top: 0;
    left: 0;
}

header.index_header {
    z-index: 2;
    position: fixed;
    left: 0;
    top: 0;
}

header .logo {
    display: block;
    width: 206px;
    height: 100px;
    position: relative;
    box-sizing: border-box;
    float: left;
    margin-right: 150px;
}

header .logo img {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
}

/*.header nav li:hover{border-bottom: 2px solid #00A1E9;box-sizing: border-box;}*/
/*.header nav li:hover a{color: #00A1E9;}*/
header nav li:nth-of-type(2).on {
    box-sizing: border-box;
}

header nav li {
    float: left;
    margin-right: 30px;
    height: 100px;
    text-align: center;
}

header nav li.on {
    border-bottom: 2px solid #00A1E9;
    box-sizing: border-box;
}

header nav li.on a {
    color: #00A1E9;
}

header nav li a:hover {
    color: #00A1E9;
}

header nav li:nth-of-type(2) {
    width: 100px;
}

header nav {
    float: left;
}

header nav a {
    box-sizing: border-box;
    font-size: 16px;
    padding: 10px;
}

.down_menu {
    width: 100px;
    background-color: #3E71A9;
    color: #fff;
    border-bottom: 1px solid #6992C1;
    box-sizing: border-box;
    padding: 0 12px;
    display: none;
}

header nav li .down_menu a {
    font-size: 12px;
    line-height: 30px;
    height: 30px;
    display: block;
    text-align: center;
    width: 100%;
    color: #fff;
    margin-bottom: 6px;
    border-bottom: 1px solid #6991C0;
    padding: 0;
}

header nav li .down_menu a:hover {
    color: #015495;
    border-bottom: 1px solid #2B6EAC;
}

header .tel {
    float: right;
    height: 26px;
    line-height: 26px;
    margin-top: 38px;
    font-size: 18px;
    color: #4DAEE5;
}

header .tel img {
    float: left;
    margin-right: 10px;
}
#slider{position: absolute;top: 0;left: 0;z-index: 1;height: 100%;}
.banner img{width: 100%;height: 100%;}

.index .page2{background: url("../images/in_bg_02.png") no-repeat;background-position: bottom;}


.index .section h2{overflow: hidden;}